[ros-users] how many points in 3D cloud?

[Michal.Stolba at cis.strath.ac.uk]

Hi,

following a tutorial on laser_pipeline:
http://www.ros.org/wiki/laser_pipeline/Tutorials/IntroductionToWorkingWithLaserScannerData

how do I know how many points are in the resulting 3D point cloud?

Thanks,

Michal